Post a few lines of sample data, a few lines of code, and then maybe we'll have something to go by. Have you gotten far enough along in perlre to learn that in a regular expression, \d matches a number, and [\dA-Fa-f] or [[:xdigit:]] would match a hex digit.

I would also recommend taking a step back, and start with a script that just reads the data and prints it. Then add something that prints the data only if it has some part of what you're looking for. Then keep restricting it until you get only what you're looking for.